You know, a happy mom , is a good mom. This is one of those situations where you need to put your needs first.
An entire generation of human beings was raised without breast milk, including me and we all turned out just fine. Sure breastfeeding is of terrific benefit to a child, but it is not vital. They are not going to turn out badly because you cannot or choose not to breast feed. I had a hard time breastfeeding. I never produced enough milk and the advice I got was " feed him more often". BS. Some women simply produce less milk. I consulted an expert, fed him every hour and a half, pumped, you name it, never happened. The first day I gave my child a bottle he slept for 6 hours straight , happy, content and that was it for me. I'd nurse him and give him what I had ,then pop a bottle in his mouth and we were all happy.
So my point in this long digression, is every pregnancy is different, every baby is different, every mom and her situation is different. Listen to your heart and head and do what is best for you. You sure don't want to be nursing and resenting the fact you are nursing AND worrying about your depression increasing WHILE you are nursing. Just the thought of all this tires ME out. Go with your instincts and you will make the right decision for YOU.